6. Avicii - $20 million

At 23, the Swedish DJ is the youngest artist on our
list—and taught himself to produce music using pirated software that he played
with from his teenage bedroom. “You don’t really need anything anymore,” he
told FORBES last year. “You need your computer.” He’s expected to release his
debut, True, in September 2013. Lead
single “Wake Me Up” has already clocked over 1.7 million downloads worldwide.